According to a new paper published in the BMJ, there is growing evidence that many of us already have a long-term immune response to coronavirus antibodies in our bodies. For vaccines, this means that antibodies are only part of immune responses, and they are not the only part.
When we are infected with COVID-19, our body forms a protective fleet of immune cells, and these defenses remain in place until the infection clears. Immunity to the virus appears to last at least several years, the study authors said.
If immunity to the infection lasts only a few months, as is the case with flu, this could prove extremely important. If we learn how long immunity to the vaccine lasts, we will be better able to determine whether we need to vaccinate people again to maintain herd immunity, and if so, when.
Infection with the COVID-19 virus creates long-lasting immunity, but only if a large number of people are infected and reach a threshold for herd immunity. To permanently control transmission, a form of “herd immunity” is needed, with large sections of the population immune to the virus, so that new infections decline so quickly that they cannot be transmitted all the time.
If you need the immunity of 70% of the population to have herd immunity, and the vaccine is only 75% effective, you would need to vaccinate 934,000 out of a million people. While immunity to a vaccine may not last forever, getting a large number of people vaccinated quickly will end a pandemic.
Over time, researchers will learn exactly which cells are necessary to be immune to a virus. There are two different ways in which the immune system can learn to make long-lasting antibodies to viruses and bacteria: induced immunity through vaccines and memory T lymphocytes. It is also crucial that the “memory T lymphocyte” persists long after the virus has been eradicated and triggers a stronger and faster immune response in the event of reinfection. For those who have recovered from COVID-19 and received the vaccine, understanding immunity and its duration can help us better understand how we can interact safely with each other during a pandemic.
We are not yet sure how long immunity might last, but now we can say with certainty that we were probably immune for eight months, and perhaps much longer. Let us start from the educated assumption that those who had the virus have a medium-term immune response that lasts at least a year. When partygoers become infected and recover, they are protected for the rest of their lives.
We know that natural immunity to COVID-19 lasts for over a year, but vaccination – the immunity associated with it could be long – is also permanent. Most vaccines, Chi says, have a specific duration of immunity that can range from a few months to decades.
It is therefore possible that the vaccine could offer stronger, longer-lasting immunity to coronavirus, even if it does not have the protein that shuts down the host’s immune response. What we do know is that it is much safer to gain immunity to a vaccine than to get it and intentionally infect the virus. This could also have implications for the effectiveness of a vaccine.
Another important question in immunology is how long vaccines against infectious diseases could be effective. Whether long-term immunity is formed after a disease or vaccination is one of the many questions researchers are trying to answer. Vaccines such as COVID-19 are too early to give a definitive answer, but most experts seem to expect immunity to last at least a year after vaccination.
I wrote about immunity to Covid-19 in April, when we only knew about a few months in which the virus had infected humans. According to the CDC, we don’t know how long immunity lasts after the vaccine or how well it works. Unfortunately, it’s too early to know what the long-term picture would be, “he said. It’s over and over That we know much more about the effects of a vaccine and its effects on the immune system, but according to the CDC, we won’t know exactly how long immunity lasts while we continue to study those who recover from COVID-19.
He said it would be premature for the government to plan a strategy for adopting immunity based on serological testing if we did not know enough about the immune response to the virus. Some people have wondered whether to give vaccines like COVID-19 to certain groups in the country.
It is unlikely to become endemic, because most people are immune to the virus for life – through natural infection and vaccination. It will be interesting to see if the vaccine – acquired immunity to the Ebola virus – is equally durable. Immunity to the COVID-19 vaccine offers potentially life-saving protection, but will it wane?